Out, out, sun spots

Biore UV Athlizm Skin Protect Milk.
Biore UV Athlizm Skin Protect Milk.PHOTO: BIORE

The beloved children's song from television series Barney & Friends goes: "Oh Mr Sun, Sun, Mr Golden Sun/Please shine down on me." But Barney never had to walk around in this tropical heat.

From observation, sun protection factor (SPF) - a measure of how well a sunscreen protects the skin from UVB rays - is one of those things you can never be sure is really working.

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A version of this article appeared in the print edition of The Sunday Times on July 21, 2019, with the headline 'Out, out, sun spots'. Print Edition | Subscribe